Pattern for circular sand molds.



L. J. ASKEW 8: W. A. MASTERS.

PATTERN FOR CIRCULAR SAND MOLDS.

APPLICATION FILED MAR. 2, 1914.

1,1 10,282. Patented ept. 8. 1914.

2 SHEBTS-SKBET 1.

l v V I A WIT 8859. INVENTORS (EV/J ASKEW IY/LL/AMA MASTERS fl w Z y Z ATTORNEY THE NORRIS PETERS CO., PHOTD-LITHQ, VASHINGTON, u. c.

UNITED STATES PATENT OFFICE.

LEVI J. ASKEW AND WILLIAM A. MASTERS, OF BIRMINGHAM, ALABAMA, ASSIGNORS QF FIFTY-SIX AND TWO-THIRDS GNE-HUNDREDTHS 'IO SAID ASKEW, THIRTY- THREE AND ONE-THIRD ONE-HUNDREDTHS TO SAIDMASTERS, AND TEN ONE- HUNDREDTHS TO JAMES BARTON, OF BIRMINGHAM, ALABAMA.

PATTERN FOR CIRCULAR SAND MOLDS.

To all whom it may concern:

Be it knownthat we, LEVI J. ASKEW and WILLIAM A. MASTERS, citizens of the United States of America, residing at Birmingham, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in a Pattern for Circular Sand Molds, of which the following is a specification.

Our invention relates to mechanism for forming circular molds more particularly used for the casting of pipes, cylinders and like cylindrical metal articles.

The object of our invention is to provide a novel pattern which is adapted to both form and pack the sand or any other substance in the flask used for molding purposes.

Our invention comprises the broadly novel idea of providing an expansible sectional pattern which is rotatably mounted within the fiask and adapted to expand as it is rotated to thereby simultaneously pack the sand or other substance and form the mold. Preferably the pattern is circular in crosssection and it is equipped with any suitable mechanism-which will act to radially eX- pand or contract the longitudinal pattern sections as it is rotated, the pattern being thereby adapted after forming the mold to be contracted and readily withdrawn from the flask. Our invention further comprises novel means for mounting and adjusting the rotatable pattern sections and also to other novel details of construction and arrangement of parts which are hereinafter more particularly described and claimed, reference being had to the accompanying drawings, in which- Figure 1 is a vertical sectional view showdetail view of the lugs on the pattern sec tion and the connecting spider members.

. Specification of Letters Patent.

Patented S t. 8, 1914..

Application filed March 2, 1914. Serial N 0. 822,026.

Similar reference numerals refer to similar parts throughout the drawings.

In carrying out our present invention we to the upper end of which is secured a bedplate 2, arranged to support a flask 3 for the formation of the mold. This flask section is provided at its base with a flange 4, the outer circumferential edge of which is tapered downwardly and adapted to engage the beveled faces of adjustable centering lugs 5. Any desired number of these lugs are mounted on the bed 2, preferably four, and each lug travels in a radially disposed guide slot 5 in the bed and they are adjusted to the required positions by set screws 6. By adjusting the blocks inwardly or outwardly the bed is adapted to receive flasks ofdiiferent diameters and to center them accurately with reference to the center of the bed where we form a central circular seat 7 having at its center a circular opening 8 which extends entirely through the bed plate. A rotatable plate or turn table 9 is mounted in the seat with its top flush with the top face of the'bed t and it I has a central circular dependingshoul'der 10 which turns in the opening 8. A raceway 11 is provided by grooving the opposing faces of the turn table 9 and seat 7 and antifriction balls 12 support the table 9 for rotation in the bed plate with a minimum fricthere being a pair of arms on each spider for each section 20 of a sectional pattern.

The pattern is made up of a plurality of longitudinal sections 20 which, in their contracted position, as shown in Fig. 1, and in dotted lines Fig. 3, will form an inner wall between which and the flask 3 the mold forming sand or material is received prior tween a pair of spider arms 19. A pin 23 is passed through the outer end of each pair of spider arms 19 and through the slot 22 of the interposed lug 21, thereby connecting each spider to a lug on each of the pattern To reduce friction, a steel sleeve 24 is passed through the slot 22 and between Q sections.

the spider arms 19, and the bolt 23 is passed through it, so that the sleeves take up the friction between the bolts and the lugs. Each spider is in the manner described, connected to each section of the pattern and as many lugs and spiders are provided as the duty on the pattern requires. 'We have shown three spiders and three sets of lugs and each spider is securely fastened to the shaft 1'7 by one or more set screws 25 so that they will not move lengthwise onthe shaft. The lower end 26 of the shaft 17 is turned and provided witha double thread 27 and at the upper end of the threaded section is left a shoulder'28. As shown this shoulder 28 is annular and overhangs the reversely inclined threads which meet and merge below it at the upper end of the threaded end '26 of the shaft. The lower end of the shaft is symmetrically tapered to a point 29. A

Near the upper end of the socket is a radial opening i in which is mounted a shank 31 to the inner 5 end of which is secured a rocking thread member 32 which is curved to conform to and mesh with the threads 27 which it engages.

tion. member 32 as shaft 17 is lowered to its extreme position and will rock it so that after a half turn of the shaft, it will pass into the reverse or shaftraising threads which will raise the shaft thereby automatically reversing its travel.

A top plate 86 is connected by dowel pins 37 to the outturned flange 38 at the top of the flask 3 and this plate at its center is providedwith a raised guide bearing 39 which receives the upper rounded end 40 of shaft 17, which end is provided with an eye bolt 41 adapted to receive a lifting hook by means of which the pattern can be lifted The outer ends of the shank have fastened thereon a crank 33 by means of which it can be rocked to any desired posi- The shoulder 28 will strike the thread out of the flask. In order to reduce the hietion of the pattern sections as they rotate and travel radially while being eXpanded and contracted and to prevent any frictional engagement of such members with the bed 2, we provide each pattern section at its lower end with abracket42 to the inner end of which is fastened a roller bearing 43. These roller bearings remain on the turntable 9 in all operating positions of the pattern sections. "When the parts are ready to start operations and are in the position shown in Fig. 1, power is applied to shaft 15 and through gears 14 and 13, the platform 9 and shaft 13 are rotated in a direction to cause the thread member 32, meshing wit-lithe thread 27 atthe lower end of the shaft, to draw the latter downwardly. It will be noted that the spiders stand near the upper ends of the lugs 21 with the pins 23 at the upper ends of the slots 22. As the shaft 17 is drawn clownwardly the pins are forced to travel down the slots which, due to their inclination, produce an outward or expanding movement of the lugs and pattern sections until the pattern is fully expanded. lVhile this expanding movement of the pattern sections is taking place the pattern and all parts connected therewith are being continuously ro- 'tated and in this manner the pattern sections act to gradually and e'ifectively compress or pack the sand or molding material between them and the flask until, when the shaft 17 reaches the extreme of its travel and reverses the thread member 32, the patter sections will be fully expanded, the sand will be rammed or packed to the desired eX- tent in the flask, and the mold or pipe will be formed with the desired diameter. It is then desirable to remove the pattern. The thread member 32 having been reversed by shoulder 28, the continued rotation of the shaft 17 causes it to co-act with the double thread 27 to raise the shaft 17, whereupon the spiders act reversely to contract the pattern sections. The pattern sections are held by clamps 34 between the top plate 36 and the turn table 9 against vertical movement in the flask during their expansion and contraction and when fully contracted or collapsed, the top plate 36 is removed and the pattern lifted out of the flask or pipe, it being noted that the shaft 17 will slip freely up through the turn table 9 or gear 13. The partial revolution which the pattern is given before the thread member 32 starts its contraction, rotates the fully expanded pattern sections sufiiciently to prevent any irregularity in the mold remaining opposite the spaces which will exist between the fully expanded sections.

The pattern is peculiarly adapted for use in forming terra-cotta or clay pipe.

1. The combination with a flask, of a cylindrical pattern located therein and formed by longitudinal sections, and mechanism for simultaneously rotating and expanding or contracting said pattern sections radially, substantially as described.

2. The combination with a flask, of a sectional pattern therein, a rotatable support for the pattern, means for operating the support, lugs carried by the pattern section, spiders cooperating with the lugs, and means for moving the spiders lengthwise the lugs in the rotation of the pattern, the connection of the spiders and lugs serving to move the sections with relation to each other during such operation of the spiders.

3. The combination with a flask of a sectional pattern arranged therein, means for rotating the pattern, spaced lugs carried by each pattern section, a spider connecting similar lugs of each section, said lugs being formed with downwardly and inwardly inclined slots connected with the spider, an operating rod secured to the spider, the lower terminals of the rod being threaded, and a fixed member cooperating with the threaded end of the rod.

4. A rotatable pattern divided into sections on longitudinal planes intersecting its axis of rotation, a shaft for imparting rotary movement to the pattern, and mechanism for expanding the pattern sections radially during the rotation of the pattern.

A cylindrical pipe pattern divided into longitudinal sections, mechanism within the pattern for rotating it, and means to gradually expand the pattern during its rotation.

6. The combination with a flask, of a sectional expansible pattern located therein, which pattern is substantially circular when contracted, and means to spread the convex sections radially during their rotation.

7. The combination of a pattern formed of longitudinal sections, and axially movable rotatable mechanism therein for spreading and rotating said sections. 8. The combination of a sectional circular pattern, with mechanism therein to radially expand said sections, means to rotate said pattern, and a turn table which supports and rotates with the pattern sections.

9. The combination with a flask, of a pattern removably disposed therein andv which is divided into longitudinal sections, a pattern expanding and contracting mechanism disposed within the pattern and connected to the sections thereof, said mecha- .nism being longitudinally movable to expand and contract the pattern, rotating means which said mechanism detachably engages and by means of which the pattern is rotated, and means responsive to the rotation of said mechanism for moving it longitudinally, substantially as described.

10. The combination of a pattern formed of longitudinal sections, axially movable rotatable mechanism therein for spreading said sections, means to rotate said mecha nism and the pattern, screw means to adjust said mechanism longitudinally responsive to its rotation, said means being reversible, when said mechanism reaches the position in which the pattern sections are fully expanded, and being adapted to contract the patterns without changing their direction of rotation.

11. A cylindrical pipe pattern divided into longitudinal sections, mechanism form rotating the pattern, and means connecting with said rotating mechanism which expand and contract the pattern sections during their continuous rotation in the same direction.

12. The combination of a pattern formed of longitudinal sections, axially movable rotatable mechanism therein forradially adjusting and rotating said sections, and means for rotating and axially adjusting said mechanism, said means comprisingdevices which automatically reverse the axial movement of said mechanism when the patterns are fully expanded.

13. In combination, a flask, a base on which said flask is detachably mounted, a turn table on said base, a pattern formed of longitudinal sections which are disposed within the flask and supported by said turn table, a topcover made fast to the top of the flask and adapted to engage the upper ends of the pattern sections, and axially adjustable mechanism within the pattern for adjusting the pattern sections radially while rotating them, substantially as described.

14. In combination, a flask supporting table, a turn table rotatably mounted in said flask supporting table, both tables having their-top surfaces flush, a sectional pattern, means to expand and contract the pattern sections, said sections in all positions being supported from said turn table and being adapted in expanded position to overhang and slidably engage the flask support, and mechanism for rotating and radially adjusting the flask sections, substantially as described.

In testimony whereof we afiix our signatures in presence of two witnesses.

LEVI J. ASKEW. W'ILLIAM A. MASTERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

